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The point $\text{P}$ in the following figure is stuck-at-$1$. The output $f$ will be

1. $\overline{\mathrm{AB} \overline{\mathrm{C}}}$
2. $\overline{\mathrm{A}}$
3. $\mathrm{AB} \overline{\mathrm{C}}$
4. $\mathrm{A}$